Is Krypton exploding or at war? Or both?

While in the original "Superman" mythology (not to mention the earlier films) Krypton was depicted as having been destroyed by natural forces, following DC's "Crisis on Infinite Earths" revamp Kryptonian warmongers themselves were to blame for the planet's ultimate demise. So which is it here? Given the vast number of ships that are seen firing at each other and exploding as Jor-El watches, the latter scenario seems the more likely one this time around.